bottom steering stem

hi to everyone just joined xs650 com im from scotland uk used to have many xs 650 in the 90,s when the first uk club was started halco tuning days .however ive decided to build a xs1 b lookalike but ive come to my first problem trying to mate the forks up can any one tell me was there change in sizes on the bottom steering stem ??? ive got a original xs1b top clamp and ive bought a new top clamp with the bigger rubber shocks and ive put the two together and the fork holes match however when i put the forks through the bottom fork stem there to wide to meet the top i got the bottom stem from a breakers and was sold as xs2 it has the damper etc but when i put top and bottom together the holes dont match hope someone can shed so light on this

to give readers a better picture ive started of with a 1972 xs2 frame , i managed to get a set of xs1b 1971 forks (no steering stem or top clamp) a nice xs1b wheel and im buying bits along the way the breakers sold me xs2 steering stem and i bought the top clamp triple tree from ebay part number 256-23435-01-98 new part so i know its right and ive got a rough xs1b top tree and the parts match fork hole,s and stem , im now thinking the bottom steering stem could be a later tx650 one as there different part numbers but im not sure so im hoping so one can shed light on this were xs2 and tx650 steering stems different

thanks for reply no they are all 34mm holes top and bottom as well as the steering damper rod etc it just seams the holes are futher apart on bottom stem maybe 4-5 mm
it has all the looks of xs2 two hole on top front for bottom headlight mount etc

thanks guys think ive got it now so my top triples right but the bottom stems xs2 and wont match so i need to get xs1- xs1b bottom stem to match top but the stem will still fit into my xs2 frame as the stems are the same yep. hi paul i live in coldingham near eyemouth 12 mls from northumberland berwick i know dk spares thats where most of my parts came from frame, forks,front wheel cheers barry

many thanks thats great info i got my stem out and it measures 225mm across end to end compared to the xs1 in the picture which states 208mm ,ive done a wee bit home work and found xs2 and tx 650 have different part numbers also . however with the help from your self and ggggary ive now found and bought a matching part number stem for xs1 xs1b brand new again many thanks guys barry

... i got my stem out and it measures 225mm across end to end compared to the xs1 in the picture which states 208mm ,ive done a wee bit home work and found xs2 and tx 650 have different part numbers also ...

The superceding 306 number for the XS1 and XS1B is certainly misleading, as it implies an XS2 part.
The suffix, 09-33 versus 60-33, is the big difference.

The only significant differences that I can find in this array of UnderBrackets are:

70 XS1 UnderBracket has 2 separate/welded tabs in front for the lower headlight adjuster bracket.
71 XS1B and later has 2 threaded protrusions in the front of the casting for mounting the lower headlight adjuster bracket.
Later XS1B's have 2 unthreaded bulges at the rear of the right bracket arm, presumably in preparation for a future gadget.
72 XS2 and later UnderBracket is wider (???), and has threaded rear bulges, for mounting the front hydraulic brake line.

The right rear part of my spare 70-71 UnderBracket is straight, with no bulbous bulge.

one thing i have noticed is the bottom stem stops are not the same the one i have xs2? tx650? has square stops, where some on the xs1 stem look like oblongs on one side any way once my new bottom stem 256-23340-62-33 arrives from texas to bonnie scotland i will take note in both stems and post here